摘要
应用CFD软件对某型双吸离心泵的内部流场进行了数值计算,给出了不同工况下叶轮出口与蜗壳耦合面静压沿周向、轴向的分布规律.通过对比试验曲线与数值计算外特性曲线,发现两者比较吻合,相对误差小于5%,且数值计算叶轮出口周向压力分布曲线与试验曲线趋势一致.采用径向力出口压力法计算模型,计算了各工况下离心泵叶轮所受的径向力及其分量.结果表明:应用数值计算结果而建立的离心泵径向力计算模型具有一定的准确性.小流量工况时,径向力随流量的增加而减少;设计流量工况附近时,径向力达到最小值且不为0;大流量工况时,径向力随流量的增加而增加.
Numerical calculation of the internal flow field in a double suction centrifugal pump was performed by commercial CFD software.The static pressures along circumferential and axial directions on impeller-volute coupling surface were calculated.By comparing the experimental results with numerical calculations,good agreement was obtained,the relative error is less than 5%,and the tendency of pressure distribution for impeller exit from numerical calculation is consistent with the experimental one.The radial force and its components were calculated with the outlet pressure method. The results show that the application of numerical model to calculate the radial force of the centrifugal pump has certain accuracy. At small flow condition, the radial force decreases with the increase of flow rate ; near the designed flow rate condition, the radial force reaches the minimum; and at large flow condition, the radial force increases with the flow rate.
出处
《排灌机械》
EI
2009年第4期205-209,共5页
Drainage and Irrigation Machinery
基金
甘肃省教育厅基金资助项目(050304)
关键词
离心泵
径向力
数值计算
静压力
耦合面
centrifugal pump
radial force
numerical calculation
static pressure
coupling surface
